kenichiro yoshimi, thanks for the help! I recompile VTK with VTK_WRAP_PYTHON and Module_vtkRenderingMatplotlib. But, calling the axis since you said displays "$ \ omega_X $". Maybe some other flags need to be put up? -- Sent from: http://vtk.1045678.n5.nabble.com/VTK-Users-f1224199.html